Pop-up base



FIG. 1 is a top perspective view of a pop-up base showing our newdesign.

FIG. 2 is a bottom perspective view thereof.

FIG. 3 is a front view thereof.

FIG. 4 is a back view thereof.

FIG. 5 is a left side view thereof.

FIG. 6 is a right side view thereof.

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines shown in the Figures are environment or show portionsof the pop-up base that form no part of the claimed design.

The shade lines in the Figures show contour and do not claim surfaceornamentation or treatment.

CLAIM The ornamental design for a pop-up base, as shown and described.